DK162754B - MULTIPLE FILM - Google Patents
MULTIPLE FILM Download PDFInfo
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- DK162754B DK162754B DK191683A DK191683A DK162754B DK 162754 B DK162754 B DK 162754B DK 191683 A DK191683 A DK 191683A DK 191683 A DK191683 A DK 191683A DK 162754 B DK162754 B DK 162754B
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- film
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- impact strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- Laminated Bodies (AREA)
- Materials For Medical Uses (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Wrappers (AREA)
- Organic Insulating Materials (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
- Cosmetics (AREA)
Abstract
Description
iin
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Den foreliggende opfindelse angår en fieri åget folie som angivet i krav l's indledning.The present invention relates to a further expanded film as set forth in the preamble of claim 1.
Fieri agede folier er kendt og anvendes f.eks. i vid udstrækning til emballage af levnedsmidler. Disse folier består af en 5 bærefolie og en med denne lamineret et- eller fieri åget folie.Fiery films are known and are used e.g. widely used for food packaging. These films consist of a 5 carrier film and one with this laminated one or more foil.
Sædvanligvis er bærefolien varmefast, biaksi alt strakt og eventuelt lakeret. Den er fortrinsvis fremstillet af cel!ulosefolie, polyester, polyamid, polypropylen eller aluminium eller består af flere enkeltfolier af de nævnte materialer. Ved den færdige emballage 10 danner bærefolien det yderste lag og skal derfor egne sig til påtryk.Usually the carrier foil is heat resistant, biaxia everything stretched and possibly varnished. It is preferably made of cellulose film, polyester, polyamide, polypropylene or aluminum or consists of several single sheets of said materials. At the finished packaging 10, the carrier foil forms the outermost layer and must therefore be suitable for printing.
Den på bærefolien laminerede folie danner indersiden af den færdige emballage, og denne folie - og i tilfælde af en flerlagsfolie i det mindste det lag, der senere danner indersiden af den 15 færdige emballage - skal derfor besidde en god svejsbarhed og af hensyn til en god forarbejdelighed have en lille friktionskoefficient for at sikre en god forarbejdelighed i emballagemaskinerne.The foil laminated on the carrier film forms the inside of the finished packaging, and this foil - and in the case of a multilayer foil at least the layer that later forms the inside of the finished packaging - must therefore have good weldability and for good processability have a small coefficient of friction to ensure good processability in the packaging machines.
Denne foliekonstruktion har imidlertid vist sig stadig ikke at være helt tilfredsstillende til forskellige anvendelsesformål, 20 især fordi gennembrydningsstyrken navnlig ved vakuumemballager stadig ikke er tilstrækkelig, og der derfor optræder betydelige uregelmæssigheder, såsom utætheder, hvilket ved mange levnedsmidler medfører, at den pågældende vare fordærves. Det kunne anses at være nærliggende at opveje den ringe gennembrydningsstyrke ved hjælp af 25 en forøget folietykkelse. Dette er imidlertid ikke muligt, fordi mange emballeringsmaskiner kun kan forarbejde folier med en bestemt maksimal tykkelse. Denne maksimal tykkel se er, når det drejer sig om kaffeemballagemaskiner, højst 110 fim.However, this foil construction has still proved to be completely unsatisfactory for various uses, 20 especially because the breakthrough strength, especially in vacuum packaging, is still not sufficient and therefore significant irregularities such as leaks occur, which in many foods cause the product concerned to be spoiled. It could be considered to offset the low breakthrough strength by an increased film thickness. However, this is not possible because many packaging machines can only process foils of a certain maximum thickness. This maximum thick look, when it comes to coffee packaging machines, is at most 110 microns.
Man har derfor allerede fremstillet fieri agede folier af 30 bærefolier og derpå laminerede koekstruderede polyethylenflerlags-folier. De anvendte koekstruderede polyethylenflerlagsfolier består ofte af to lag, af hvilke det ene sædvanligvis består af copolymeren af polyethylen med høj slagstyrke, d.v.s. stor sejhed, og det andet består af en normal polyethylen (homopolyethylen, LDPE, d.v.s low 35 density polyethylen). Alternativt har man lamineret laget af en polyethylen med høj slagstyrke men fortrinsvis LDPE-laget på bærefolien. Skønt gennembrydningsstyrken ved dette system har kunnet øges, har også disse fieri agede folier mangler, således at de stadig ikke på tilfredsstillende måde kan anvendes i alleTherefore, numerous foil films of 30 carrier foils and then laminated co-extruded polyethylene multilayer foils have already been prepared. The co-extruded polyethylene multilayer sheets used often consist of two layers, one of which usually consists of the copolymer of high impact polyethylene, i.e. high toughness and the other consists of a normal polyethylene (homopolyethylene, LDPE, i.e., low 35 density polyethylene). Alternatively, the layer of a high impact polyethylene has been laminated but preferably the LDPE layer on the carrier foil. Although the breakthrough strength of this system has been able to increase, these elaborate foils also have defects, so that they still cannot be used satisfactorily in all
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2 anvendelsesområder. Ulempen ved en sådan fieri åget folie er en for ringe planstilling ved højere forarbejdningstemperaturer, således at der ofte optræder forstyrrelser, især ved emballeringsmaskiner, der arbejder med høj hastighed. Arsagen hertil er især forskellige 5 varmeudvidel seskoefficienter af flerlagsfoliens to lag og forskellige folietykkelser af flerlagsfoliens to lag, således at denne så at sige virker som et bimetal og derved giver foliebanen en tendens til sammenrulning. Denne tendens optræder i særlig høj grad ved en flerlaget lamineret folie, ved hvilket laget af en polyethylen med 10 høj slagstyrke ligger mellem bærefolien og LDPE-laget. Dersom laget af polyethylen med høj slagstyrke derimod anvendes som det underste lag, medens LDPE-laget er lamineret på bærefolien, opnås ganske vist, at den fieri agede foliebanes tendens til sammenrulning formindskes, men på grund af den for det meste ru overflade af laget af 15 polyethylen med høj slagstyrke, vil der opstå forarbejdningsvanskeligheder. Tilsætning af glidemidler til polyethylenen, af hvilken dette lag er fremstillet, er kun mulig inden for visse grænser, fordi disse midler vandrer ind i de andre lag og reducerer lamineringsstyrken.2 applications. The disadvantage of such a folded foil is that of low leveling at higher processing temperatures, so that disruptions often occur, especially in high speed packaging machines. The reason for this is in particular different heat exchanger coefficients of the two layers of multilayer foil and different foil thicknesses of the two layers of multilayer foil, so that it almost acts as a bimetal, thereby giving the film web a tendency to roll. This tendency is particularly pronounced with a multilayer laminated film, in which the layer of a high impact polyethylene 10 lies between the support film and the LDPE layer. On the other hand, if the high impact polyethylene layer is used as the bottom layer while the LDPE layer is laminated to the backing film, it is obtained that the tendency of the multi-layered film web to roll is diminished, but due to the mostly rough surface of the layer of 15 high impact polyethylene, processing difficulties will occur. Addition of lubricants to the polyethylene from which this layer is made is only possible within certain limits because these agents migrate into the other layers and reduce the lamination strength.
20 En anden ulempe ved de kendte fieri agede folier er deres utilstrækkelige formfoldbarhed, hvorved skal forstås foliens evne til at blive stående, således som den foldes uden eller kun i ringe grad at fjedre tilbage. Denne formfoldbarhed er f.eks. vigtig ved vakuumemballager til kaffe, hvor en f.eks. kasseformet forfoldet 25 folie efter afskubningen fra en sædvanligvis til foldningen anvendt foldedorn uden at fjedre tilbage beholder sin kasseform, og derved muliggør en problemløs påfyldning af påfyldningsgodset.Another disadvantage of the well-known films is their insufficient shape foldability, which means the ability of the film to remain standing, as it is folded back without or to a small extent. This formability is e.g. important in vacuum packaging for coffee, where one e.g. The box-shaped folded foil after pushing from a commonly used folding mandrel without spring back retains its box shape, thereby allowing a trouble-free filling of the filling goods.
Fra EP-patentansøgning nr. 0 008 934 kendes desuden et koekstruderet folielaminat, der anvendes uden at være lamineret på 30 en bærefolie. Dette folielaminats inder- og yderlag er forbundne med hinanden ved hjælp af en smelteforbindelse. De inderst beliggende lag forbindes med hinanden ved hjælp af et klæbemiddellag, f.eks. af polyurethanklæbemiddeltypen. Også dette folielaminat har den allerede beskrevne ulempe i form af en for ringe gennembrydningsstyrke, 35 hvilket kan forklares ved, at de to inderlag på grund af deres faste forbindelse med hinanden ved hjælp af klæbemiddel forbindelsen forholder sig som en enkeltfolie.Furthermore, from EP Patent Application No. 0 008 934 there is known a co-extruded foil laminate which is used without being laminated to a carrier foil. The inner and outer layers of this foil laminate are joined to each other by means of a melting compound. The innermost layers are joined together by means of an adhesive layer, e.g. of the polyurethane adhesive type. Also, this foil laminate has the disadvantage already described in the form of a too low breakthrough strength, which can be explained by the fact that the two inner layers due to their fixed connection with each other by means of adhesive compound behave as a single foil.
Formålet med opfindelsen er at tilvejebringe en flerlagsfolie bestående af en bærefolie og et på denne bærefolie lamineretThe object of the invention is to provide a multilayer film consisting of a carrier film and a laminated one on this carrier film.
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3 folielaminat, ved hvilken alle disse ulemper er eliminerede, og som især besidder en høj gennembrydningsstyrke, og selv ved højere temperaturer indtager en god planstilling og har en god formfold-barhed, og som om ønsket ved sin modsat bærefolien beliggende side 5 har en god gi ideevne på metal.3 foil laminate, in which all these drawbacks are eliminated, and which in particular possess a high breakthrough strength, and even at higher temperatures occupy a good planar position and have good formability and, as desired, with its opposite side 5, have a good give ideas on metal.
Til løsning af denne opgave foreslås ifølge opfindelsen en flerlagsfolie med de i krav l's kendetegnende del angivne ejendommeligheder.In order to solve this problem, according to the invention, a multilayer foil with the characteristics specified in claim 1 is proposed.
Det blæste koekstruderede folielaminat består fortrinsvis af 10 to lag. Det kan dog til forskellige anvendelsesformål også være hensigtsmæssigt at anvende slanger med tre - fem lag og forbinde disse til henholdsvis en seks- eller tilaget folie. På denne måde kan der anvendes yderligere lag, f.eks. af polyvinyl al kohol med yderligere funktion (gasspærre).The blown co-extruded foil laminate preferably consists of two layers. However, for various applications, it may also be appropriate to use tubes with three to five layers and to connect them to a six or made film respectively. In this way additional layers can be used, e.g. of polyvinyl alcohol with additional function (gas barrier).
15 Yderlagene sammensmeltes ved overfladen med inderlagene under ekstrusionen. Inderlagene sammenpresses under anvendelse af varme og tryk ved hjælp af et kl emme val separ. Den færdige sammenpressede fieri agede slange forbehandles hensigtsmæssigt på kendt måde på den ene side og lamineres på ligeledes kendt måde på en et-20 eller fieri åget bærefolie.The outer layers are fused at the surface with the inner layers during extrusion. The inner layers are compressed using heat and pressure by means of a pinch valve separ. The finished compressed fiery hose is conveniently pretreated in known manner on one side and laminated in a known manner also on a single or further increased carrier foil.
Den afgørende betydning ved den fieri agede folie ifølge opfindelsen ligger i den symmetriske opbygning af det med bærefolien laminerede og til en i det mindste firelaget slange sammenpressede koekstruderede folielaminat. Ved den symmetriske opbygning opnås 25 selv ved højere temperaturforskelle en væsentlig bedre planstilling under forarbejdning end ved de hidtil anvendte tolagede folielaminater med asymmetrisk opbygning. Den foran beskrevne bimetal effekt er elimineret, idet den symmetriske opbygning bevirker, at de kræfter, der giver folien en tilbøjelighed til sammenrulning mod den 30 ene eller den anden side gensidigt ophæver hinanden.The decisive importance of the multi-layered film according to the invention lies in the symmetrical construction of the co-extruded coil extruded film laminate laminated with the carrier film and to a at least four-layered hose. In the symmetrical structure, even at higher temperature differences, a significantly better planing position is obtained during processing than with the previously used two-layered foil laminates with asymmetrical structure. The bimetallic effect described above is eliminated in that the symmetrical structure causes the forces which give the foil a tendency to roll towards one or the other mutually cancel each other.
Ved anvendelsen af en fieri åget folie ifølge opfindelsen bestående af en bærefolie og et koekstruderet og sammenpresset folielaminat med yderlag A,A' og inderlag B,B' opnås i forhold til de kendte foliekonstruktioner, der f.eks. består af en bærefolie med 35 en etlagspolyethylenfolie, den fordel, at der ved samme tykkelse af folielaminaterne opnås en væsentlig større gennembrydningsstyrke henholdsvis, at folielaminatets total tykkel se ved samme gennembrydningsstyrke kan være væsentligt mindre, hvorved der opnås en betydelig materialebesparelse og desuden opnås store fordele med hensynBy using a further expanded film according to the invention consisting of a carrier film and a coextruded and compressed foil laminate with outer layers A, A 'and inner layers B, B' are obtained in relation to the known foil structures, e.g. consists of a carrier film having a single-layer polyethylene film, the advantage that at the same thickness of the foil laminates a substantially greater breakthrough strength is obtained, respectively, that the total thickness of the foil laminate can be substantially less at the same breakthrough strength, thereby obtaining considerable material savings and furthermore great advantages are obtained. with regard to
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4 til den videre forarbejdning i forarbejdningsmaskinerne. Den større gennembrydningsstyrke skyldes især, at inderlagene B,B' er forbundne med hinanden ved en sammenpresningsforbindelse og ikke en smelteforbindelse eller en klæbeforbindelse og derfor ved optrædende tryk-5 eller stødbelastninger kan glide på hinanden eller løfte sig fra hinanden, og at i det mindste det ene af det blæste koekstruderede folielaminats lag henholdsvis mindst to lag af den sammenpressede slange består af en polyolefin eller olefincopolymerer med en slagstyrke > 100 cN. Endvidere forbedres gennembrydningsevnen 10 yderligere ved, at der mellem lagene A, B og A', B' fås en vis udligning af styrken i maskin- og tværretningen som følge af blæse-hovedets rotation.4 for further processing in the processing machines. In particular, the greater breakthrough strength is due to the fact that the inner layers B, B 'are connected to one another by a compression joint and not a melting compound or an adhesive joint and therefore, at the occurrence of pressure or shock loads, can slide on each other or lift apart, and that at least one of the blown co-extruded foil laminates or at least two layers of the compressed hose, respectively, consists of a polyolefin or olefin copolymers having a impact strength> 100 cN. Furthermore, the breakthrough ability 10 is further improved by providing some equalization between the layers A, B and A ', B' in the machine and transverse direction due to the rotation of the blow head.
Det er ifølge opfindelsen vigtigt, at der til folielaminatets inderlag B, B' vælges en polyethylen eller ethylencopolymer med 15 en god evne til under tryk og varme at indgå en god sammenpresningsforbindelse og har høj slagstyrke.According to the invention, it is important that for the inner layer B, B 'of the foil laminate a polyethylene or ethylene copolymer having a good ability to enter into a good compression compound and having high impact strength is selected.
Ved sammenpresningsforbindelse skal her forstås en forbindelse mellem lagene B, B', der kan løses mekanisk. Fortrinsvis er den ved sammenpresningsforbindelsen af lagene B, B' opnåede ved-20 hængningskraft ikke større end 100 cN/cm. Til yderlagene A, A' vælges derimod godt svejsbare materialer med en lille friktionskoefficient på metal.Compression joint here means a connection between the layers B, B 'which can be mechanically solved. Preferably, the adhesive force obtained by compressing the layers B, B 'is not greater than 100 cN / cm. For the outer layers A, A ', however, well-weldable materials with a small coefficient of friction on metal are chosen.
Det vil forstås, at man til fremstilling af koekstruderede folielaminater, der kan dybtrækkes, bibeholder folielaminatet i 25 ikke-strakt tilstand.It will be appreciated that for the preparation of coextruded, deep-drawn film laminates, the film laminate is retained in a non-stretched state.
Det har ifølge opfindelsen vist sig at være hensigtsmæssigt at anvende et koekstruderet folielaminat, ved hvilken yderlagene eller inderlagene er fremstillet af et materiale, hvis slagstyrke er mindst 25 cN, fortrinsvis mindst 50 cN større end slagstyrken af det 30 koekstruderede folielaminats andre lag. Særligt egnet til fremstilling af det koekstruderede folielaminats lag har ethylenvinylacetatpolymerer EVA med en vinyl acetatandel på op til 35 vægtprocent vist sig at være. Copolymerer med 3-10 vægtprocent vinyl acetat og et smelteindeks på 0,2 - 4,0, fortrinsvis på 0,5 -35 1,5, må anses at være ganske særligt velegnede. Disse copolymerer kan både anvendes som yderlag A, A' og som inderlag B, B'. Alt eftersom disse ethylenvinylacetatcopolymerer anvendes som ydereller som inderlag, kan de indeholde glidemidler eller antiblokmid-ler. Det foretrækkes at anvende lagene afIt has been found, according to the invention, to use a coextruded foil laminate in which the outer layers or inner layers are made of a material whose impact strength is at least 25 cN, preferably at least 50 cN greater than the impact strength of the other coextruded foil laminate. Particularly suitable for preparing the co-extruded film laminate layer, ethylene vinyl acetate polymers EVA with a vinyl acetate content of up to 35% by weight have been found to be. Copolymers with 3-10% by weight of vinyl acetate and a melt index of 0.2 - 4.0, preferably 0.5 - 35 1.5, are considered to be particularly suitable. These copolymers can be used both as outer layers A, A 'and as inner layers B, B'. As these ethylene vinyl acetate copolymers are used as outer or as inner layers, they may contain lubricants or antiblocking agents. It is preferred to apply the layers
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5 ethylenvinylacetatcopolymerer som inderlag B, B', fordi denne formstoftype nemt indgår i en sammenpresningsforbindelse og desuden på grund af sin blødhed og dårlige friktionsværdier mod metal samt på grund af en vis eddikelugt, der tiltager med stigende vinylace-5 tatindhold, er mindre godt egnet til fremstilling af yderlagene A,A'. En anvendelse også som yderlag A,A' er dog også mulig, dersom de nævnte ulemper ikke er af afgørende betydning, og der desuden ønskes en god svejsbarhed.5 ethylene vinyl acetate copolymers as inner layers B, B 'because this type of fabric easily enters into a compression compound and also because of its softness and poor friction values against metal and because of some vinegar odor which increases with increasing vinyl acetate content, is less suitable for making the outer layers A, A '. However, an application also as outer layer A, A 'is also possible if the aforementioned disadvantages are not essential and a good weldability is also desired.
Til fremstilling af vakuumdybtræksemballager, der tåler at 10 udsættes for varme, har inderlag af vinylacetatcopolymerer med et vinylacetatindhold på 20 - 28 vægtprocent vist sig at være særligt fordelagtige, fordi disse inderlags ekstremt bløde karakter næsten helt udelukker dannelsen af luftlommer i sammenpresningsplanet, således at der under opvarmningen ikke findes begyndelsessteder for 15 en luftbiæredannelse, der vil medføre partiel del aminering.For the preparation of vacuum-drenched packages that can withstand heat, inner layers of vinyl acetate copolymers having a vinyl acetate content of 20-28% by weight have been found to be particularly advantageous because the extremely soft nature of these inner layers almost completely excludes the formation of air pockets in the compression plane. during heating, there are no starting sites for air carrier formation that will cause partial amination.
Særlig velegnet til yderlagene er LLDPE (linear-low-density-polyethylene) med en tæthed på 0,918 - 0,945, fortrinsvis på 0,922 -0,930. Denne polyethylens smelteindeks ligger ved 0,2 - 4,0. Fortrinsvis anvendes en LLDPE med et smelteindeks på 0,8 - 1,5.Particularly suitable for the outer layers are LLDPE (linear-low-density polyethylene) with a density of 0.918-0.945, preferably 0.922-0.930. The melt index of this polyethylene is at 0.2 - 4.0. Preferably, an LLDPE having a melt index of 0.8 - 1.5 is used.
20 Denne polyethylengruppe kan anvendes med eller uden gi ide middel og eventuelt indeholde silikat som antiblokmiddel. Slagstyrken af LLDPE når spidsværdier på 175 cN, hvorfor en sådan LLDPE er særdeles velegnet til opfindelsens formål.This polyethylene group can be used with or without a gelling agent and optionally contain silicate as an antiblocking agent. The impact strength of LLDPE reaches peak values of 175 cN, which is why such LLDPE is particularly well suited for the purposes of the invention.
Til fremstilling af temperaturbelastbare folier, navnlig til 25 vakuumdybtræksembal!ager, har yderlag af high-density-polyethylene (HDPE, havtrykspolyethylen) og polypropylen især af en ustrakt folie af en polypropylencopolymer (PPUG) med en tilsætning af ethylen på 1 - 4 molekyl vægtprocent, fortrinsvis 2-3 molekylvægtprocent, vist sig at være særligt velegnede. Disse yderlag er navnlig egnede i 30 kombination med inderlag af ethylen-vinylacetat, der indeholder 20 -28 vægtprocent vinyl acetat.For the production of temperature-loadable films, in particular for 25 vacuum-depth packaging, outer layers of high-density polyethylene (HDPE, marine pressure polyethylene) and polypropylene, in particular, of an unstretched film of a polypropylene copolymer (PPUG) with an addition of ethylene of 1 to 4 molecular weight percent , preferably 2-3 molecular weight percent, proved to be particularly suitable. These outer layers are particularly suitable in combination with inner layers of ethylene-vinyl acetate containing 20 to 28% by weight of vinyl acetate.
Ganske særligt velegnet har en med ionerne af natrium eller zink tværbunden ethylenmethacrylsyrecopolymer, som kendes under betegnelsen ionomerharpiks og fremstilles af firmaet Dupont under 35 handelsnavnet Surlyn, vist sig at være. Da slagstyrken af med natrium tværbundet ionomerharpiks er op til 450 cN, anvendes dette materiale fortrinsvis til fremstilling af inderlagene B, B\ Foruden den fremragende slagstyrke udmærker dette materiale sig ved gode sammenpresningsforbindelsesegenskaber, en god ol ieresistens og godParticularly well suited is a sodium or zinc crosslinked ethylene methacrylic acid copolymer known by the term ionomeric resin and manufactured by the company Dupont under the trade name Surlyn. Since the impact strength of sodium crosslinked ionomer resin is up to 450 cN, this material is preferably used for the preparation of the inner layers B, B. In addition to the excellent impact strength, this material is distinguished by good compression bonding properties, good oil resistance and good
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6 ekstruderbarhed.6 extrudability.
I den foreliggende ansøgning baseres alle angivelser af den mekaniske chockstyrke på måling efter ASTM D-1709-62 ved en faldhøjde på 650 mm og en folietykkelse på 25 /an.In the present application, all indications of the mechanical shock strength are based on measurement according to ASTM D-1709-62 at a drop height of 650 mm and a film thickness of 25 / an.
5 Til opfindelsens formål har det vist sig at være fordelag tigt at danne inderlagene B, B' af polyethylen henholdsvis ethylen-copolymerer med højere mekanisk chockstyrke end yderlagene A, A'. Opfindelsen er dog ikke begrænset hertil.For the purposes of the invention, it has been found advantageous to form the inner layers B, B 'of polyethylene and ethylene copolymers, respectively, with higher mechanical shock strength than the outer layers A, A'. However, the invention is not limited thereto.
Til yderlagene og som polyethylen med en mindre høj si agio styrke kommer fortrinsvis LDPE i betragtning. Denne er nemt tilgængelig, har fremragende maskin!øbsegenskaber, gode svejseegenskaber og findes i handelen i et stort antal typer, således at det for svejseprocessen vigtige yderlag af det koekstruderede folielaminat, der danner den færdige emballages inderlag, let kan tilpasses efter 15 de egnede emballagemaskiner. Sædvanligvis anvendes LDPE med en tæthed på 0,918 - 0,934, fortrinsvis 0,922 - 0,928, og et smelteindeks på 0,2 - 4,0, fortrinsvis 0,7 - 2,0.Preferably, LDPE is considered for the outer layers and as polyethylene with a less high si agio strength. It is easily accessible, has excellent machining properties, good welding properties and is commercially available in a large number of types, so that the outer layer of the co-extruded foil laminate forming the inner layer of the finished packaging can be easily adapted to the suitable packaging machines. . Usually, LDPE with a density of 0.918 - 0.934, preferably 0.922 - 0.928, and a melt index of 0.2-4.0, preferably 0.7-2.0, is used.
Af de foran nævnte råstoffer kan de følgende ganske særligt foretrukne varianter til fremstilling af en fieri åget folie ifølge 20 opfindelsen afledes, uden at opfindelsen er begrænset til disse varianter: 1. Yderlagene A, A' består af LDPE, der er tilsat antiblok- og gi ideadditiver i sædvanlig mængde. Inderlagene B, B' består af en ethylenvinylacetatcopolymer. En sådan fieri åget folie egner 25 sig især til vakuumemballage af kaffe og har fremragende overfladeegenskaber, en god foldbarhed og får på grund af de af ethylenvinylacetatcopolymeren fremstillede inderlag en stor gennembrydni ngsstyrke.From the aforementioned raw materials, the following particularly preferred variants for making a further foil according to the invention can be derived, without limiting the invention to these variants: 1. The outer layers A, A 'consist of LDPE added to antiblock and give id additives in usual amount. The inner layers B, B 'consist of an ethylene vinyl acetate copolymer. Such a widened film is particularly suitable for vacuum packaging of coffee and has excellent surface properties, good foldability and, due to the inner layer made of the ethylene vinyl acetate copolymer, has a great breakthrough strength.
30 2. Yderlagene A, A' består af LLDPE, inderlagene B, B' består af en ethylenvinylacetatcopolymer. Denne variant har en endnu større gennembrydningsstyrke og kan desuden dybtrækkes.2. The outer layers A, A 'consist of LLDPE, the inner layers B, B' consist of an ethylene vinyl acetate copolymer. This variant has an even greater breakthrough strength and can also be deep drawn.
3. Yderlagene A, A' består af en ethylenvinylacetatcopolymer, in-35 deri agene B, B' består af en med natriumioner tværbunden ethy- lenmethacrylsyrecopolymer. Ved denne opbygning får den fler-lagede folie en stor gennembrydningsstyrke og en særlig udpræget evne til at kunne dybtrækkes. Fortrinsvis anvendes denne folie til emballering af kød, ost og nødder.3. The outer layers A, A 'consist of an ethylene vinyl acetate copolymer, including agents B, B' consist of a ethylene methacrylic acid copolymer crosslinked with sodium ions. In this construction, the multilayer foil gains a great breakthrough strength and a particularly pronounced ability to be deep drawn. Preferably, this film is used for packaging meat, cheese and nuts.
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7 4. Yderlagene A, A' består af HDPE eller en copolymer af polypropylen med 2-3 molekylvægtprocent ethyl en, inderlagene består af en ethylenvinylacetatcopolymer med 20 - 30 vægtprocent vinylacetatandel. Fortrinsvis anvendes denne folie til 5 emballering af færdiglavede madretter, d.v.s. emballagegods, der skal opvarmes til høj temperatur for at udelukke en hurtig fordærvelse.7 4. The outer layers A, A 'consist of HDPE or a copolymer of polypropylene with 2-3 molecular weight percent ethyl one, the inner layers consisting of an ethylene vinyl acetate copolymer with 20 to 30 weight percent vinyl acetate proportion. Preferably, this film is used for packaging of ready-made food, i.e. packaging goods that need to be heated to high temperature to preclude rapid spoilage.
Som bærefolie kan anvendes ikke-strakte eller biaksialt 10 strakte folier på basis af polyamid, polyester, polypropylen og cellulosefolie, der eventuelt yderligere er lamineret med aluminiumfolie og pålægges med et klæbemiddel.As carrier film, non-stretched or biaxially stretched films based on polyamide, polyester, polypropylene and cellulose film may be used, which may be further laminated with aluminum foil and applied with an adhesive.
Til ikke-dybtrukne emballager, som f.eks. vakuumemballager til kaffe, ligger den fulde tykkelse af den kendte flerlagede folie 15 på ca. 100 pi. Deraf er tykkelsen af bærefolien, der eventuelt består af to lag ca. 15 - 25 pi. Da de sædvanlige tykkelser af ikke-dybtrukne lamineringsfolier ligger omkring 25 - 100 pi, for det meste 50 - 75 /tm, og det ikke er muligt at fremstille de enkelte lag af det koekstruderede folielaminat med gennemsnitlige tykkelser < 10 20 /tm, består ved anvendelsen af den flerlagede folie ifølge opfindelsen i det ovennævnte anvendelsesområde det koekstruderede folielaminat henholdsvis den sammenpressede slange fortrinsvis af fire lag.For non-deep packaging, such as vacuum packaging for coffee, the full thickness of the known multilayer foil 15 is approx. 100 pi. The thickness of the carrier film, which may consist of two layers, is approx. 15 - 25 pi. Since the usual thicknesses of non-extruded laminating films are about 25 - 100 µm, mostly 50 - 75 µm, and it is not possible to produce the individual layers of the coextruded film laminate with average thickness <10 20 µm, consisting of the use of the multilayer film according to the invention in the aforementioned field of application, the co-extruded film laminate and the compressed hose, respectively, preferably of four layers.
Fortrinsvis andrager tykkelsen af lagene A, A' 1/2 - 4/5 af den samlede tykkelse af det koekstruderede folielaminat henholdsvis 25 den sammenpressede slange, medens den samlede tykkelse af lagene 6, B' ikke underskrider 1/5 af den samlede tykkelse henholdsvis overskrider 1/2 af den samlede tykkelse. De på denne måde fremstillede sammenpressede slanger har en samlet tykkelse på mindst 40 pi og højst 500 pi og ligger fortrinsvis ved 70 - 100 pi for ikke-30 dybtrukne folier, medens dybtræksfolier også har større tykkelser, og det foretrukne område ligger mellem 80 pm og 250 pi.Preferably, the thickness of layers A, A '1/2 - 4/5 of the total thickness of the coextruded foil laminate and the compression hose, respectively, while the total thickness of layers 6, B' does not fall below 1/5 of the total thickness respectively. exceeding 1/2 of the total thickness. The compressed hoses thus produced have a total thickness of at least 40 µl and a maximum of 500 µl, and are preferably at 70-100 µl for non-30 extruded foils, while deep-draw foils also have greater thicknesses, and the preferred range is between 80 µm and 250 pi.
De flerlagede folier ifølge opfindelsen kan anvendes i et bredt område inden for emballageindustrien og har vist sig at være ganske særligt egnede til vakuumemballager, ved hvilke der er fare 35 for gennembrydning af emballagen, og her anvendes til emballagen ved: dybtrukne vakuumemballager, især til kødvarer, ost og nødder, sådanne folier, som har en bærefolie af ikke-strakt polyamidThe multilayer foils of the invention can be used in a wide range in the packaging industry and have been found to be particularly suitable for vacuum packaging in which there is a danger of breakthrough of the packaging and used here for the packaging by: deep-drawn vacuum packaging, especially for meat products. , cheese and nuts, such foils having a non-stretched polyamide carrier film
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8 samt et koekstruderet folielaminat med yderi ag A, A7 af ethyl en -vinylacetatcopolymer og inderlag B, B7 af med metalioner tvær-bundne ethylenmethacrylsyrecopolymerer, 5 ikke-dybtrukne vakuumemballager, især til kaffe og lignende, iltfølsomme produkter, sådanne folier, som har en bærefolie af med aluminium lamineret polyesterfolie, metal!iseret eller PVDC-lakeret strakt polyesterfolie eller polyamidfolie samt et koekstruderet folielaminat med yderlag A, A7 af en ethylenvi-10 nylacetatcopolymer og inderlag B, B7 af med natriumioner tværbunden ethylenmethacrylsyrecopolymer eller yderlag A, A7 af LLDPE og inderlag B, B7 af ethyl envinylacetatcopolymer.8 and a co-extruded foil laminate with outer ag A, A7 of ethylene-vinyl acetate copolymer and inner layer B, B7 of ethylene methacrylic acid cross-linked ethylene methacrylic copolymers, 5 non-extruded vacuum packaging, in particular for coffee and the like, oxygen sensitive products, such films having a carrier foil of aluminum laminated polyester foil, metallized or PVDC lacquered stretched polyester foil or polyamide foil and a co-extruded foil laminate with outer layer A, A7 of an ethylene vinyl acetate copolymer and inner layer B, B7 of sodium ions crosslinked ethylene methyl acrylic layer or and inner layer B, B7 of ethyl envinyl acetate copolymer.
Opfindelsen forklares nærmere under henvisning til tegnin-15 gen, uden at opfindelsen er begrænset til de på tegningen viste udførelsesformer. På tegningen viser: fig. 1 et skematisk billede af et tværsnit gennem en tolaget koekstruderet blæst slange, fig. 2 et tværsnit gennem en del af den samme slange 20 men i sammenpresset tilstand, fig. 3 et skematisk billede af et snit gennem en flerlaget folie ifølge opfindelsen, ved hvilken den i fig. 2 viste slange er lamineret på en enkeltlaget bærefolie af polyamid.The invention is explained in more detail with reference to the drawing, without limiting the invention to the embodiments shown in the drawing. In the drawing: FIG. 1 is a schematic cross-sectional view of a two-layer coextruded blown hose; FIG. 2 is a cross-section through a portion of the same hose 20 but in compressed state; FIG. 3 is a schematic view of a section through a multilayer film according to the invention, in which the embodiment of FIG. 2 is laminated to a single-layer polyamide support film.
25 I fig. 1 betegner A og B henholdsvis det yderste og det inderste lag af et koekstruderet folielaminat 1.In FIG. 1 represents A and B, respectively, the outermost and innermost layers of a co-extruded foil laminate 1.
Fig. 2 viser den ved sammenpresning af det i fig. 1 viste folielaminat 1 fremstillede slangeblok l7. Lagene A, A7 er ved 3 forbundne med lagene B, B7 ved smelteforbindelse.FIG. 2 shows it by compressing the device shown in FIG. 1, the hose block 17 shown in the foil laminate 1. Layers A, A7 are joined at 3 with layers B, B7 by melting.
30 De inderste lag B, B7 er forenede langs linien 4 ved hjælp af en sammenpresningsforbindelse. Den side, der inden lamineringen er underkastet en elektrisk forbehandling, er betegnet med 2.The innermost layers B, B7 are joined along line 4 by means of a compression joint. The side, which is subjected to electrical pre-treatment before lamination, is designated 2.
I fig. 3 betegner 6 en bærefolie af polyamid, der med et klæbemiddel 5 er lamineret på den sammenpressede slange Γ.In FIG. 3, 6 denotes a polyamide carrier film which is laminated to the compressed hose Γ with an adhesive 5.
35 De følgende eksempler tjener til yderligere forklaring af opfindelsen, uden at opfindelsen er begrænset til disse udførelseseksempler.The following examples serve to further explain the invention without limiting the invention to these exemplary embodiments.
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99
Eksempel 1:Example 1:
Til fremstilling af fieri agede vakuumdybtræksfolier fremstilles tolagede blæste koekstruderede folielaminater i forskellig 5 tykkelse, og den blæste slange sammenpresses. De yderste lag A, A' af dette firi agede folielaminat består af en ethylencopolymer med en den af vinylacetat på 4,2 vægtprocent, en slagstyrke på 145 cN og et smelteindeks på 0,8. De to inderste lag B, B' består af en med natriumioner tværbunden ethylenmethacrylsyrecopolymer, der har en 10 slagstyrke på 450 cN og et smelteindeks på 1,4. Total tykkel sen af de to yderste lag A, A' udgør 2/3, og total tykkel sen af de to inderste lag B, B' 1/3 af den sammenpressede slanges total tykkel se. I en forsøgsrække fremstilledes sammenpressede slanger med den foran beskrevne opbygning med total tykkel ser på 80, 100, 120, 140, 160, 15 180, 200, 220 og 240 μιπ. De sammenpressede slanger lamineredes med bærefolier af ikke-strakt polyamid 6 med en tykkelse svarende til den halve tykkelse af den sammenpressede slange.For the preparation of multi-layered vacuum depth film, bi-layered blown co-extruded film laminates of different thickness are prepared and the blown tube is compressed. The outer layers A, A 'of this four-sided foil laminate consist of an ethylene copolymer having a vinyl acetate of 4.2% by weight, a impact strength of 145 cN and a melt index of 0.8. The two innermost layers B, B 'consist of an ethylene methacrylic acid crosslinked ethylene methacrylic acid copolymer having a impact strength of 450 cN and a melt index of 1.4. The total thickness of the two outer layers A, A 'is 2/3, and the total thickness of the two inner layers B, B' is 1/3 of the total thickness of the compressed hose. In a series of experiments, compressed hoses of the above-described structure with total thickness look of 80, 100, 120, 140, 160, 15 180, 200, 220 and 240 μιπ were prepared. The compressed tubes were laminated with non-stretched polyamide 6 carrier sheets of a thickness equal to half the thickness of the compressed tubing.
I et sammenligningsforsøg foretoges i et emballeringsforsøg, ved hvilket der emballeredes krumme kødpølser, en sammenligning 20 mellem en af de foran beskrevne fieri agede folier ifølge opfindelsen med en total tykkelse på 240 mm og en kendt dybtræksfolie, der havde en total tykkel se på 300 /im og bestod af en 100 /wn tyk ikke-strakt polyamidfolie og et dermed ved en sammenpresningsforbindelse forbundet tolaget folielaminat af ethylencopolymer med en andel vinyl-25 acetat på 8 vægtprocent, hvis enkelte lag hver havde en tykkelse på 100 μm. Trods denne formindskelse på 60 μπι af tykkelsen og trods den mindre andel vinyl acetat viste den fieri agede folie ifølge opfindelsen bedre dybtræksegenskaber (en glat udtrukken fordybning) og mindre gennembrydningslækager end den hidtidige folie.In a comparison experiment, in a packaging experiment in which curved meat sausages were packaged, a comparison 20 was made between one of the aforementioned multi-layered films of the invention having a total thickness of 240 mm and a known depth-drawing film having a total thickness of 300 µm. and consisted of a 100 / wn thick non-stretched polyamide foil and a two-layer ethylene copolymer, two-layer vinyl acetate of 8% by weight, compressed by a compression compound, each layer having a thickness of 100 µm each. Despite this reduction of 60 μπι of the thickness and despite the smaller proportion of vinyl acetate, the fiery film according to the invention showed better tensile properties (a smooth elongated depression) and less breakthrough leaks than the previous film.
30 I yderligere et sammenligningsforsøg foretoges en sammen ligning mellem en af de i eksempel 1 beskrevne flerlagede folier ifølge opfindelsen med en total tykkel se på 360 μη\ og en konventionel flerlaget folie, hvis enkelte lag bestod af polyamid/LDPE/LDPE/po-lyamid LPDE, og som havde en total tykkel se på 365 im. Denne fler-35 lagede folie består af to polyamid/polyethylenfolielaminater, der ved smelteekstrusion er forenede med polyethylen til en femlags-folie. Sådanne folier anvendes til emballering af pølser, der kendes under betegnelsen "Pfefferblock". Trods den lidt mindre totaltykkelse opnåedes lige gode produktionsresultater, men her ligger denIn a further comparative experiment, a comparison was made between one of the multilayer films described in Example 1 with a total thickness of 360 μη and a conventional multilayer film, each of which consisted of polyamide / LDPE / LDPE / polyamide. LPDE and which had a total thick look of 365 im. This multilayer film consists of two polyamide / polyethylene foil laminates which, by melt extrusion, are joined with polyethylene to a five-layer film. Such foils are used for packaging sausages known as "Pfefferblock". Despite the slightly lower total thickness, equally good production results were achieved, but here it is
DK 162754 BDK 162754 B
10 egentlige fordel i den væsentligt enklere fremstilling af folien ifølge opfindelsen, idet der her kun kræves én enkelt lamineringsproces i stedet for tre som ved den kendte folie.10 has the inherent advantage in substantially simpler production of the film according to the invention, requiring only a single lamination process instead of three as in the known film.
5 Eksempel 2:Example 2:
Til fremstilling af en flerlaget folie til vakuumemballage fremstilles ved blæseekstrusion under anvendelse af en metalliseret polyesterfolie på 12 μτη som bæremateriale tre forskellige tolagede folielaminater. De fremstilledes slanger sammenpresses og lamineres 10 med bærefolien.To prepare a multilayer vacuum packaging film, by blow extrusion, using a 12 μτη metallized polyester film as a carrier, three different two-layered film laminates are prepared. The tubes of the fabricated are compressed and laminated with the carrier foil.
I: De to yderste lag A,A' af den sammenpressede folielaminatslange består af LDPE med en slagstyrke på 86 cN, et smelteindeks på 15 2,0, og de to inderste lag B, B' består af polyethylenvinyl- acetatcopolymer med en vinyl acetatandel på 5 vægtprocent, en slagstyrke på 150 cN og et smelteindeks på 2,0.I: The two outermost layers A, A 'of the compressed foil laminate hose consist of LDPE with a impact strength of 86 cN, a melt index of 2.0, and the two inner layers B, B' consist of polyethylene vinyl acetate copolymer with a vinyl acetate proportion of 5 wt%, a impact strength of 150 cN and a melt index of 2.0.
II: De to yderste lag består af LLDPE med en slagstyrke på 175 cN, 20 et smelteindeks på 1,0, de to inderste lag svarer til de under I beskrevne lag.II: The two outermost layers consist of LLDPE with a impact strength of 175 cN, a melt index of 1.0, the two innermost layers corresponding to the layers described under I.
III: De to yderste lag A, A' består af ethylencopolymerer med en vinyl acetat andel på 3 vægtprocent, en slagstyrke på 150 cN og 25 et smelteindeks på 2,0. De to inderste lag B, B' består af en med natriumioner tværbunden ethylenmethacrylsyrecopolymer med en slagstyrke på 450 cN og et smelteindeks på 1,4.III: The two outermost layers A, A 'consist of ethylene copolymers with a vinyl acetate content of 3% by weight, a impact strength of 150 cN and a melt index of 2.0. The two innermost layers B, B 'consist of an ethylene methacrylic acid crosslinked ethylene methacrylic acid copolymer with a impact strength of 450 cN and a melt index of 1.4.
Den samlede tykkelse af den sammenpressede slange var 85 pi 30 ved alle tre varianter, hvoraf yderlagene A og A' udgjorde 2/3, og inderlagene B, B' udgjorde 1/3 af denne tykkelse, således at den samlede tykkelse inklusive klæbemiddel og bærefolie var 100 pi.The total thickness of the compressed hose was 85 µl for all three variants, of which the outer layers A and A 'were 2/3 and the inner layers B, B' were 1/3 of this thickness, so that the total thickness including adhesive and carrier foil was 100 µl.
Som sammenligningsmateriale lamineredes en metalliseret polyesterfolie som bærefolie med en 45 mm tyk polyethylenfolie 35 (LDPE), således at denne folie inklusive klæbemiddel fik en samlet tykkelse på 100 pi.As a comparative material, a metallized polyester film was laminated as a carrier film with a 45 mm thick polyethylene film 35 (LDPE) so that this film including adhesive had a total thickness of 100 µl.
Ved emballer!ngsforsøg med vakuumemballering af kaffeemballager på 250 g på en dornhjulsmaskine gav folierne ifølge opfindelsen en væsentligt mindre lækageprocent.In packaging experiments with vacuum packaging of 250 g coffee packages on a mandrel wheel machine, the films of the invention gave a substantially smaller leakage rate.
1111
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Eksempel 3:Example 3:
Ved yderligere et forsøg, ved hvilket kaffeemballager på 250 og 500 g vakuumpakkedes på en slangeposemaskine, anvendtes til sammenligning følgende beskrevne folier.In another experiment, in which coffee packages of 250 and 500 g were vacuum-packed on a hose sachet, the following described foils were used for comparison.
5 Til fremstilling af en fieri åget folie ifølge opfindelsen anvendtes en med en 12 μπι tyk alufolie lamineret bi aks i alt strakt polyamidfolie på 15 μπι, som lamineredes på en sammenpresset koekstruderet firlaget folielaminatslange, hvis yderlag A, A' bestod af LDPE med en slagstyrke på 86 cN og et smelteindeks på 0,8, og 10 hvis inderlag B, B' bestod af en ethylenvinylacetatcopolymer, hvis vinyl acetatandel var 5 vægtprocent, og som havde en slagstyrke på 150 cN og et smelteindeks på 2,0. Den samlede tykkelse af de to yderlag A, A' var 50 μπι, og den samlede tykkelse af inderlagene B, B' var 25 μπι. Den færdige laminerede fieri agede folie havde en 15 samlet tykkelse på 105 μπι.For the manufacture of a further increased foil according to the invention, a 12 µπι thick aluminum foil laminated bi-axle was used in a total stretched 15 µπι polyamide foil which was laminated to a compressed coextruded four-layer foil laminate hose whose outer layer A, A 'consisted of LDPE with a impact strength. of 86 cN and a melt index of 0.8, and 10 whose inner layer B, B 'consisted of an ethylene vinyl acetate copolymer whose vinyl acetate content was 5% by weight and had a impact strength of 150 cN and a melt index of 2.0. The total thickness of the two outer layers A, A 'was 50 μπι, and the total thickness of the inner layers B, B' was 25 μπι. The finished laminated fiery film had a total thickness of 105 μπι.
Til sammenligning fremstilledes en konventionel folie af det samme bæremateriale som foran beskrevet, og som blev lamineret med en 75 /im tyk folie af LDPE med en slagstyrke på 86 cN og et smelteindeks på 0,8, således at tykkelsen inklusive klæbemiddel også her 20 var 105 μπι.In comparison, a conventional film of the same support material as described above was prepared which was laminated with a 75 µm thick LDPE film with a impact strength of 86 cN and a melt index of 0.8, so that the thickness including adhesive was also 20 here. 105 μπι.
Ved et emballeringsforsøg med vakuumpakning af kaffe opnåedes med folien ifølge opfindelsen en 40% mindre lækagerate.In a vacuum packaging packaging trial, the film according to the invention achieved a 40% less leakage rate.
25 1 3525 1 35
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3216097 | 1982-04-30 | ||
| DE3216097A DE3216097C2 (en) | 1982-04-30 | 1982-04-30 | Multi-layer film made of a carrier film and a laminated composite film and its use |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| DK191683D0 DK191683D0 (en) | 1983-04-28 |
| DK191683A DK191683A (en) | 1983-10-31 |
| DK162754B true DK162754B (en) | 1991-12-09 |
| DK162754C DK162754C (en) | 1992-04-27 |
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ID=6162325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK191683A DK162754C (en) | 1982-04-30 | 1983-04-28 | MULTIPLE FILM |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0093423B1 (en) |
| AT (1) | ATE20215T1 (en) |
| DE (2) | DE3216097C2 (en) |
| DK (1) | DK162754C (en) |
| FI (1) | FI78642C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3315652C2 (en) * | 1983-04-29 | 1986-04-30 | Feldmühle AG, 4000 Düsseldorf | Thermoforming composite film and its use for the production of vacuum thermoforming packs for holding plastic bags with blood infusion solution |
| DE3315582C2 (en) * | 1983-04-29 | 1986-04-24 | Feldmühle AG, 4000 Düsseldorf | Thermoforming film |
| DE3343150A1 (en) * | 1983-11-29 | 1985-06-05 | Günter H. Dr.-Ing. 8035 Gauting Marx | Process for heat-sealing layers, especially for closing containers |
| DE3618793A1 (en) * | 1986-06-04 | 1987-12-10 | Helio Folien Gmbh | COMPOSITE FILM |
| DE3708780A1 (en) * | 1987-03-18 | 1988-09-29 | Helio Folien Gmbh | MULTILAYER FILM |
| JPH0820704B2 (en) * | 1988-11-17 | 1996-03-04 | 富士写真フイルム株式会社 | Laminated film |
| JPH07104573B2 (en) * | 1988-12-29 | 1995-11-13 | 富士写真フイルム株式会社 | Packaging material |
| DE4415426A1 (en) * | 1994-05-03 | 1995-11-09 | Ucb Helio Folien Gmbh | Laminated plastic film for packaging and use of packaging |
| DE19500766C2 (en) * | 1995-01-13 | 2000-10-05 | M & W Verpackungen Gmbh | Process for producing a film with high puncture resistance |
| DE19806475A1 (en) * | 1998-02-17 | 1999-08-19 | Wolff Walsrode Ag | Multi-layer sealing layer and hermetically sealable packaging material made with it |
| EP2397417A1 (en) * | 2010-06-16 | 2011-12-21 | Mondi AG | Film bag with a plastic film as the bag wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3187982A (en) * | 1960-07-21 | 1965-06-08 | Union Carbide Corp | Method for forming coated uniaxially oriented films and the product formed thereby |
| GB954347A (en) * | 1962-12-17 | 1964-04-02 | Monsanto Chemicals | Method and apparatus for forming a multiply molded article |
| DE1966466C3 (en) * | 1969-05-09 | 1974-10-10 | Alkor-Werk, Karl Lissmann Kg, 8000 Muenchen | Method and device for producing a composite film web. Eliminated from: 1923852 |
| DK128061B (en) * | 1969-06-24 | 1974-02-25 | Nielsen Emballag | Method for joining layers of foil. |
| BE754507A (en) * | 1969-08-08 | 1971-02-08 | Dow Chemical Co | PERFECTED ARTICLE PACKAGING PROCESS |
| DE2102377B2 (en) * | 1971-01-19 | 1972-12-21 | METHOD AND DEVICE FOR MANUFACTURING A MULTI-LAYER PLASTIC FILM | |
| AR207667A1 (en) * | 1974-12-23 | 1976-10-22 | Grace W R & Co | PROCEDURE TO OBTAIN ORIENTED POLYAMIDE LAMINATES AND THE LAMINATE SO OBTAINED |
| US4082877A (en) * | 1975-02-14 | 1978-04-04 | W. R. Grace & Co. | Unoriented composite laminar film with an elastomeric layer and sealable layer |
| GB1495380A (en) * | 1976-01-23 | 1977-12-14 | Mobil Oil Corp | Low density polyethylene film laminates |
| JPS5382888A (en) * | 1976-12-29 | 1978-07-21 | Kureha Chem Ind Co Ltd | Co-extruded five-layered drawn cylindrical film and its manufacture |
| CA1111372A (en) * | 1978-07-03 | 1981-10-27 | Henry G. Schirmer | Cross-linked nylon/polyolefin laminates |
| JPS6043301B2 (en) * | 1978-08-31 | 1985-09-27 | 三井化学株式会社 | Multilayer laminated film and its manufacturing method |
| US4229241A (en) * | 1978-12-04 | 1980-10-21 | W. R. Grace & Co. | Process for making a multi layer polyolefin shrink film |
-
1982
- 1982-04-30 DE DE3216097A patent/DE3216097C2/en not_active Expired - Lifetime
-
1983
- 1983-04-27 FI FI831436A patent/FI78642C/en not_active IP Right Cessation
- 1983-04-28 DK DK191683A patent/DK162754C/en not_active IP Right Cessation
- 1983-04-29 DE DE8383104206T patent/DE3363907D1/en not_active Expired
- 1983-04-29 EP EP83104206A patent/EP0093423B1/en not_active Expired
- 1983-04-29 AT AT83104206T patent/ATE20215T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE20215T1 (en) | 1986-06-15 |
| FI78642C (en) | 1989-09-11 |
| EP0093423A3 (en) | 1984-09-05 |
| DE3363907D1 (en) | 1986-07-10 |
| EP0093423B1 (en) | 1986-06-04 |
| DE3216097A1 (en) | 1983-11-03 |
| DE3216097C2 (en) | 1990-05-10 |
| DK191683D0 (en) | 1983-04-28 |
| EP0093423A2 (en) | 1983-11-09 |
| FI831436A0 (en) | 1983-04-27 |
| FI831436L (en) | 1983-10-31 |
| FI78642B (en) | 1989-05-31 |
| DK162754C (en) | 1992-04-27 |
| DK191683A (en) | 1983-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUP | Patent expired |